Paul is admitted to the bar in New York. He is also a barrister in independent practice at the English bar, where he is a member of Doughty Street Chambers, one of the leading London sets. Paul began his career as an associate of Cleary Gottlieb Steen & Hamilton, the New York-headquartered international law firm, where he practiced in the international litigation, arbitration, and public international law groups. He has also acted as tribunal secretary in several commercial and investment arbitrations chaired by Michael Moser, the eminent Hong Kong-based arbitrator.
Paul has lectured on international arbitration and international investment law at Harvard Law School, Stanford Law School, and City University of Hong Kong Law School, and has presented papers at conferences in the United States and Europe. He was formerly a Visiting Fellow at the Lauterpacht Centre for International Law at Cambridge University.